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Here are the step-by-step instructions you need to follow to create the assemblies in Visual Studio 2005:
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Creating an Assembly in Visual Studio 2005
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1. In Visual Studio 2005, create a new C# project. Use the Database folder and the SQL Server Project template.
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This template is not available in Visual Studio 2005, Standard edition. If you're working with the Standard edition, use the Class Library template and manually write all the code.
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In the New Project dialog box, specify the following information:
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Name: CSUDAs Location: C:\ Solution Name: UDAs When you're done entering the information, confirm that it is correct. 3. At this point, you'll be requested to specify a database reference. Create a new database reference to the tempdb database in the SQL Server instance you're working with, and choose it. The database reference you choose tells Visual Studio where to deploy the UDAs that you develop. After confirming the choice of database reference, a question box will pop up asking you whether you want to enable SQL/CLR debugging on this connection. Choose No. The sample UDAs you'll build in this chapter are quite simple, and there won't be a need for debugging. In the Solution Explorer window, right-click the CSUDAs project, select the menu items Add and Aggregate, and then choose the Aggregate template. Rename the class Aggregate1.cs to CSUDAs_Classes.cs, and confirm. Examine the code of the template. You'll find that a UDA is implemented as a structure (struct in C#, Structure in Visual Basic .NET). It can be implemented as a class as well. The first block of code in the template includes namespaces that are used in the assembly (lines of code starting with "using"). Add three more statements to include the following namespaces: System.Text, System.IO, and System.Runtime.InteropServices. (You can copy those from Listing 6-8.) You are going to use the StringBuilder class from the System.Text namespace, the BinaryReader and BinaryWriter classes from the System.IO namespace, and finally the StructLayout attribute from the System.Runtime.InteropServices namespace (in the second UDA).
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Rename the default name of the UDAwhich is currently the same name as the name of the class (CSUDAs_Classes)to CSStrAgg. You'll find four methods that are already provided by the template. These are the methods that every UDA must implement. However, if you use the Class Library template for your project, you have to write them manually. Using the Aggregate template, all you have to do is fill them with your code. Following is a description of the four methods:
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Init: This method is used to initialize the computation. It is invoked once for each group that the query processor is aggregating. Accumulate: The name of the method gives you a hint of its purposeaccumulating the aggregate values, of course. This method is invoked once for each value (that is, for every single row) in the group that is being aggregated. It uses an input parameter, and the parameter has to be of the datatype corresponding to the native SQL Server datatype of the column you are going to aggregate. The datatype of the input can also be a CLR UDT. Merge: You'll notice that this method uses an input parameter with the type that is the aggregate class. The method is used to merge multiple partial computations of an aggregation. Terminate: This method finishes the aggregation and returns the result. 9. Add two internal (private) variablessb and firstConcatto the class just before the Init method. You can do so by simply copying the code that declares them from Listing 6-8. The variable sb is of type StringBuilder and will hold the intermediate aggregate value. The firstConcat variable is of type Boolean and is used to tell whether the input string is the first you are concatenating in the group. For all input values except the first, you are going to add a comma in front of the value you are concatenating.
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10. Override the current code for the four methods with the code implementing them from Listing 68. Keep in mind the following points for each method:
In the Init method, you initialize sb with an empty string and firstConcat with true. In the Accumulate method, note that if the value of the parameter is NULL, the accumulated value will be NULL as well. Also, notice the different treatment of the first value, which is just appended, and the following values, which are appended with the addition of a leading comma. In the Merge method, you are simply adding a partial aggregation to the current one. You do so by calling the Accumulate method of the current aggregation, and adding the termination (final value) of the other partial aggregation. The input of the Merge function refers to the class name, which you revised earlier to CSStrAgg. The Terminate method is very simple as well; it just returns the string representation of the aggregated value. 11. Delete the last two rows of the code in the class from the template; these are a placeholder for a member field. You already defined all member fields you need at the beginning of the UDA. 12. Next, go back to the top of the UDA, right after the inclusion of the namespaces. You'll find attribute names that you want to include. Attributes help Visual Studio in deployment, and they
help SQL Server to optimize the usage of the UDA. UDAs have to include the Serializable attribute. Serialization in .NET means saving the values of the fields of a class persistently. UDAs need serialization for intermediate results. The format of the serialization can be native, meaning they are left to SQL Server or defined by the user. Serialization can be native if you use only .NET value types; it has to be user-defined if you use .NET reference types. Unfortunately, the string type is a reference type in .NET. Therefore, you have to prepare your own serialization. You have to implement the IBinarySerialize interface, which defines just two methods: Read and Write. The implementation of these methods in our UDA is very simple. The Read method uses the ReadString method of the StringBuilder class. The Write method uses the default ToString method. The ToString method is inherited by all .NET classes from the topmost class, called System.Object. Continue implementing the UDA by following these steps: a. Specify that you are going to implement the IBinarySerialize interface in the structure. You do so by adding a colon and the name of the interface right after the name of the structure (the UDA name). b. Copy the Read and Write methods from Listing 6-8 to the end of your UDA. c. Change the Format.Native property of the SqlUserDefinedAggregate attribute to Format.UserDefined. With user-defined serialization, your aggregate is limited to 8000 bytes only. You have to specify how many bytes your UDA can return at maximum with the MaxByteSize property of the SqlUserDefinedAggregate attribute. To get the maximum possible string length, specify MaxByteSize = 8000. 13. You'll find some other interesting properties of the SqlUserDefinedAggregate attribute in Listing 6-8. Let's explore them:
IsInvariantToDuplicates: This is an optional property. For example, the MAX aggregate is invariant to duplicates, while SUM is not. IsInvariantToNulls: This is another optional property. It specifies whether the aggregate is invariant to NULLs. IsInvariantToOrder: This property is reserved for future use. It is currently ignored by the query processor. Therefore, order is currently not guaranteed. IsNullIfEmpty: This property indicates whether the aggregate will return a NULL if no values have been accumulated. 14. Add the aforementioned properties to your UDA by copying them from Listing 6-8. Your first UDA is now complete! 15. Listing 6-8 also has the code to implement a product UDA (CSProdAgg). Copy the complete code implementing CSProgAgg to your script. Note that this UDA involves handling of big integers only. Because the UDA internally deals only with value types, it can use native serialization. Native serialization requires that the StructLayoutAttribute be specified as StructLayout.LayoutKindSequential if the UDA is defined in a class and not a structure. Otherwise, the UDA implements the same four methods as your previous UDA. There is an additional check in the Accumulate method that prevents out-of-range values. 16. Finally, add the Visual Basic .NET version of both UDAs created so far:
a. From the File menu, choose the menu items Add and New Project to load the Add New Project dialog box. Navigate through the Visual Basic project type and the Database folder, and choose SQL Server Project. Don't confirm yet. b. In the Add New Project dialog box, specify Name as VBUDAs and Location as C:\. Then confirm that the information is correct. c. Use the same database connection you created for the C# project (the connection to tempdb). The name of the database connection you created earlier should be instancename.tempdb.dbo. d. In the Solution Explorer window, right-click the VBUDAs project, select Add, and choose the Aggregate template. Before confirming, rename the class Aggregate1.vb to VBUDAs_Classes.vb. e. Replace all code in VBUDAs_Classes.vb with the Visual Basic .NET code implementing the UDAs from Listing 6-9. 17. Save all files by choosing the File menu item and then Save All. 18. Create the assemblies by building the solution. You do this by choosing the Build menu item and then Build Solution. 19. Finally, deploy the solution by choosing the Build menu item and then Deploy Solution.
Both assemblies should be cataloged at this point, and all four UDAs should be created. All these steps are done if you deploy the assembly from Visual Studio .NET.
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